RR7.2 fix made the indoor branch fire (119K frames vs 0), but visual
verification showed missing interior textures — the inn's floor + lower
wall sections rendered as fog-color clear instead of cell-mesh polygons.
Root cause: BFS short-circuited at registry-build time on intermediate
cells that hadn't yet streamed in. The Holtburg Inn has 2 entry portals
+ 209 interior leaves; if any intermediate cell wasn't loaded when lbInfo
arrived, BFS stopped, EnvCellIds was a tiny subset of the building's true
cells, camCellIds at the gate excluded most inn cells, and IndoorPass
skipped their mesh entities → flat fog-color floor.
Fix: walk the dat directly in BFS via `dats.Get<EnvCell>(cellId)
.CellPortals` (matches WB PortalService.cs:67-79). BFS now completes
deterministically at registry-build time regardless of cell load
ordering. Exit-portal polygon collection (Step C) also gets a dat
fallback so the stencil mask is complete on first indoor frame.
BuildingLoader.Build signature gains two optional params:
- dats: DatCollection? — null in unit tests preserves old behavior
- landblockOrigin: Vector3 — translation for dat-side polygons
Tests: 11/11 pass (unit-test path unchanged via dats == null).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
LoadedCell.BuildingId (init + internal setter) — set exactly once at
landblock load time by BuildingLoader; null when the cell isn't
part of any building (outdoor surface cells; dungeon cells not
enumerated in LandBlockInfo.Buildings).
GameWindow landblock-load path: builds BuildingRegistry from
LandBlockInfo.Buildings; stamps each cell's BuildingId; stores the
registry on _buildingRegistries[landblockId] (GameWindow-level dict)
for render-frame lookups. Note: LoadedLandblock is AcDream.Core.World
(a sealed record) — adding an App-type field there would violate
Code Structure Rule #2, so the registry is stored in a new
GameWindow-level dictionary instead. Cleanup wired in both
removeTerrain lambdas (OnLoad + OnResize paths).
drainedCells dict: the existing _pendingCells drain loop is extended
to also build a local CellId→LoadedCell dict; BuildingLoader.Build
uses this dict for the stamping pass so no second iteration is needed.
New BuildingLoaderTest verifies the stamping path. 5 BuildingLoader
tests total (4 from RR3 + 1 new).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
New per-landblock data model for WB-style per-building cell scoping:
Building — BuildingId, EnvCellIds, ExitPortalPolygons,
occlusion-query state (Step 5 lifecycle)
BuildingRegistry — two-way indexed (by cellId + by buildingId);
single source of truth per landblock
BuildingLoader — static factory from LandBlockInfo.Buildings;
walks interior portals to expand cell sets;
collects exit portal polygons in world space
10 new unit tests cover data invariants + registry indexing + loader
mapping per the algorithm resolved in RR2 findings.
LoadedCell.BuildingId stamping wired in RR4. Render-time consumption
arrives in RR7 (Steps 1-4) + RR9 (Step 5) + RR11 (RenderOutsideIn).
Design: docs/superpowers/specs/2026-05-26-phase-a8-wb-full-port-design.md
Spike: docs/research/2026-05-26-a8-buildings-data-shape.md
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
